Display panel and manufacturing method therefor, display device

Abstract

A display panel includes: a first substrate, a driving circuit layer including a plurality of thin-film transistors, a planarization layer including a first portion, a second portion, and a third portion; where a thickness of the first portion is less than that of the second portion, and a thickness of the third portion is less than that of the second portion; the first portion includes a first through hole; a light-emitting device including an anode, where the anode covers the first portion and a lateral surface adjacent to the first portion, of the second portion, and an angle between a surface at a side away from the first substrate, of a part of the anode covering the lateral surface of the second portion and a surface parallel to a plane where the first substrate is located, of the anode, is greater than 0.

1 - 20 . (canceled) 
     
     
         21 . A display panel comprising a plurality of subpixels, wherein the display panel comprises:
 a first substrate;   a driving circuit layer located on a side of the first substrate and comprising a plurality of thin-film transistors;   a planarization layer located on a side away from the driving circuit layer, of the first substrate, and comprising: a plurality of first portions, a plurality of second portions, and a plurality of third portions; wherein in a direction perpendicular to the first substrate, a thickness of the first portion is less than a thickness of the second portion, and a thickness of the third portion is less than the thickness of the second portion; an orthographic projection of the second portion on the first substrate encloses an orthographic projection of the first portion on the first substrate; the orthographic projection of the first portion on the first substrate covers an orthographic projection of a light-emitting region of a subpixel on the first substrate, and an orthographic projection of the third portion on the first substrate is within an orthographic projection of a region between light-emitting regions of adjacent subpixels on the first substrate; the first portion comprises a first through hole penetrating through the thickness of the first portion;   a plurality of light-emitting devices located on a side away from the first substrate, of the planarization layer; wherein the light-emitting device comprises an anode; the anode covers the first portion and a lateral surface adjacent to the first portion, of the second portion; an angle between a surface at a side away from the first substrate, of a part of the anode covering the lateral surface of the second portion and a surface parallel to a plane where the first substrate is located, of the anode, is greater than 0; the anode is electrically connected with the thin-film transistor through the first through hole; and   a pixel definition layer located on a side away from the planarization layer, of the anode;   wherein an orthographic projection of the pixel definition layer on the first substrate covers an orthographic projection of the first through hole on the first substrate.   
     
     
         22 . The display panel of  claim 21 , wherein the angle between the surface at the side away from the first substrate, of the part of the anode covering the lateral surface of the second portion and the surface parallel to the plane where the first substrate is located, of the anode, is greater than or equal to 30° and less than or equal to 50°. 
     
     
         23 . The display panel of  claim 21 , wherein in the direction perpendicular to the first substrate, the thickness of the first portion is equal to the thickness of the third portion. 
     
     
         24 . The display panel of  claim 23 , wherein in the direction perpendicular to the first substrate, a difference between the thickness of the second portion and the thickness of the first portion is greater than or equal to 0.5 μm and less than or equal to 1 μm. 
     
     
         25 . The display panel of  claim 21 , wherein the pixel definition layer comprises a plurality of first opening regions and a plurality of second opening regions; an orthographic projection of the first opening region on the first substrate is within the orthographic projection of the first portion on the first substrate, an orthographic projection of the second opening region on the first substrate is within the orthographic projection of the third portion on the first substrate; the orthographic projection of the second portion on the first substrate is within the orthographic projection of the pixel definition layer on the first substrate. 
     
     
         26 . The display panel of  claim 25 , wherein a ratio of area of an overlapping region of the orthographic projection of the second portion on the first substrate and the orthographic projection of the pixel definition layer on the first substrate to area of the orthographic projection of the pixel definition layer on the first substrate is less than or equal to 76%. 
     
     
         27 . The display panel of  claim 25 , wherein a maximum distance between a surface at a side away from the first substrate, of the pixel definition layer and the first portion is greater than or equal to 1.5 μm and less than or equal to 2.5 μm. 
     
     
         28 . The display panel of  claim 25 , further comprising:
 a plurality of auxiliary electrodes arranged in a layer same with a layer where the anode is located, and insulated from the anode; an orthographic projection of the auxiliary electrode on the first substrate is within the orthographic projection of the second portion on the first substrate.   
     
     
         29 . The display panel of  claim 28 , wherein the pixel definition layer further comprises a plurality of third opening regions, and an orthographic projection of the third opening region on the first substrate is within the orthographic projection of the auxiliary electrode on the first substrate. 
     
     
         30 . The display panel of  claim 29 , wherein the pixel definition layer comprises a plurality of fourth portions and a plurality of fifth portions, the fourth portion comprises the third opening region, and an orthographic projection of the fifth portion on the first substrate covers the orthographic projection of the first through hole on the first substrate;
 the fourth portion and the fifth portion are connected in one piece.   
     
     
         31 . The display panel of  claim 21 , wherein a transmittance of the pixel definition layer to light with a wavelength greater than or equal to 380 nm and less than or equal to 700 nm is less than 5%. 
     
     
         32 . The display panel of  claim 21 , further comprising: a second substrate on a side away from the first substrate, of the pixel definition layer, and a filling layer between the second substrate and the pixel definition layer. 
     
     
         33 . The display panel of  claim 32 , wherein a distance h between adjacent first opening regions satisfies: 
       
         
           
             
               
                 h 
                 ≥ 
                 
                   a 
                   × 
                   b 
                   / 
                   
                     ( 
                     
                       d 
                       - 
                       b 
                     
                     ) 
                   
                 
               
               ; 
             
           
         
         wherein a is a distance between the second substrate and the anode covering the first portion in the direction perpendicular to the first substrate, d is a distance between the second portion and the first portion in the direction perpendicular to the first substrate, and b is a maximum width of the first opening region in a direction parallel to a plane where the first substrate is located. 
       
     
     
         34 . The display panel of  claim 32 , wherein a distance h between adjacent first opening regions satisfies: 
       
         
           
             
               
                 h 
                 ≥ 
                 
                   a 
                   × 
                   b 
                   / 
                   
                     ( 
                     
                       c 
                       - 
                       b 
                     
                     ) 
                   
                 
               
               ; 
             
           
         
         wherein a is a distance between the second substrate and the anode covering the first portion in the direction perpendicular to the first substrate, c is a maximum distance between a side away from the first substrate, of the pixel definition layer and the first portion in the direction perpendicular to the first substrate, and b is a maximum width of the first opening region in a direction parallel to a plane where the first substrate is located. 
       
     
     
         35 . The display panel of  claim 32 , further comprising a curved-surface region;
 wherein in the curved-surface region, a distance h between two adjacent first opening regions satisfies:   
       
         
           
             
               
                 h 
                 ≥ 
                 
                   
                     ( 
                     
                       a 
                       - 
                       d 
                     
                     ) 
                   
                   × 
                   b 
                   / 
                   
                     ( 
                     
                       
                         ( 
                         
                           
                             1 
                             K 
                           
                           - 
                           a 
                         
                         ) 
                       
                       × 
                       d 
                       × 
                       K 
                     
                     ) 
                   
                 
               
               ; 
             
           
         
         wherein a is a distance between the second substrate and the anode covering the first portion in the direction perpendicular to the first substrate, d is a distance between the second portion and the first portion in the direction perpendicular to the first substrate, b is a maximum width of the first opening region in a direction parallel to a plane where the first substrate is located, and K is a curvature of the curved-surface region. 
       
     
     
         36 . The display panel of  claim 32 , further comprising a curved-surface region;
 in the curved-surface region, a distance h between two adjacent first opening regions satisfies:   
       
         
           
             
               
                 h 
                 ≥ 
                 
                   
                     ( 
                     
                       a 
                       - 
                       c 
                     
                     ) 
                   
                   × 
                   b 
                   / 
                   
                     ( 
                     
                       
                         ( 
                         
                           
                             1 
                             K 
                           
                           - 
                           a 
                         
                         ) 
                       
                       × 
                       c 
                       × 
                       K 
                     
                     ) 
                   
                 
               
               ; 
             
           
         
         wherein a is a distance between the second substrate and the anode covering the first portion in the direction perpendicular to the first substrate, c is a maximum distance between a side away from the first substrate, of the pixel definition layer and the first portion in the direction perpendicular to the first substrate, b is a maximum width of the first opening region in a direction parallel to a plane where the first substrate is located, and K is a curvature of the curved-surface region. 
       
     
     
         37 . A method for manufacturing a display panel, comprising:
 forming a driving circuit layer on a side of a first substrate; wherein the driving circuit layer comprises a plurality of thin-film transistors;   forming a pattern of a planarization layer on a side away from the first substrate, of the driving circuit layer; wherein the planarization layer comprises: a plurality of first portions, a plurality of second portions, and a plurality of third portions; in a direction perpendicular to the first substrate, a thickness of the first portion is less than a thickness of the second portion, and a thickness of the third portion is less than the thickness of the second portion; an orthographic projection of the second portion on the first substrate encloses an orthographic projection of the first portion on the first substrate; the orthographic projection of the first portion on the first substrate covers an orthographic projection of a light-emitting region of a subpixel on the first substrate; an orthographic projection of the third portion on the first substrate is within an orthographic projection of a region between light-emitting regions of adjacent subpixels on the first substrate; the first portion comprises a first through hole penetrating through the first portion;   forming a plurality of anodes on a side away from the first substrate, of the planarization layer; the anode covers the first portion and a lateral surface adjacent to the first portion, of the second portion, an angle between a surface at a side away from the first substrate, of a part of the anode covering the lateral surface of the second portion and a surface parallel to a plane where the first substrate is located, of the anode, is greater than 0; the anode is electrically connected with the thin-film transistor through the first through hole; and   forming a pattern of a pixel definition layer on a side away from the planarization layer, of the anode;   wherein an orthographic projection of the pixel definition layer on the first substrate covers an orthographic projection of the first through hole on the first substrate.   
     
     
         38 . The method of  claim 37 , wherein the forming the pattern of the planarization layer on the side away from the first substrate, of the driving circuit layer, comprises:
 depositing a planarization layer material on the side away from the first substrate, of the driving circuit layer to form the planarization layer;   forming the first portions, the second portions and the third portions by performing a halftone masking process on the planarization layer.   
     
     
         39 . The method of  claim 37 , wherein the forming the pattern of the pixel definition layer on the side away from the planarization layer, of the anode, comprises:
 forming the pixel definition layer on the side away from the planarization layer, of the anode;   forming a plurality of first opening regions and a plurality of second opening regions by a patterning process; an orthographic projection of the first opening region on the first substrate is within the orthographic projection of the first portion on the first substrate, an orthographic projection of the second opening region on the first substrate is within the orthographic projection of the third portion on the first substrate, the orthographic projection of the second portion on the first substrate is within the orthographic projection of the pixel definition layer on the first substrate.   
     
     
         40 . A display device, comprising the display panel of  claim 21 .